Al Abed, A. ., & Al Baba, M. . (2020). The Effect of Using Roger Bybee Model on Understanding Arithmetic Operations on Regular Fractions and Decimals for sixth Graders . Dirasat: Educational Sciences, 47(2), 1–18. Retrieved from http://dsr.ju.edu.jo/djournals/index.php/Edu/article/view/2163